"Super c-tau factory: precision experiments with tau lepton and charmed hadrons"

Vorobyev V.S. (Senior researcher, BINP SB RAS)
Levichev E.B. (Vice-director of BINP SB RAS)
Logashenko I.B. (Vice-director of BINP SB RAS)

 

The discovery of the Higgs boson in 2021 completed confirmation of the Standard model (SM) of particle physics. However, SM is not the final theory of matter. A major goal of modern high energy physics is search for phenomena beyond SM (BSM) that can manifest itself as the new fundamental particles or via discrepancies between the results of precision measurements and the SM predictions.

The “Crab waist” particle beams collision scheme, proposed in 2006, paved the way for the new generation of colliders - super factories - with a luminosity two orders of magnitude higher than that of modern machines. The super B factory SuperKEKB in Japan and the planned Z and Higgs factory FCC-ee at CERN are based on this principle. The Super c-tau (SCT) factory is a project of the super-factory-class collider aimed at the threshold production of tau leptons and charmed hadrons, their comprehensive and detailed study and the search for the BSM phenomena. The SCT factory project includes longitudinal polarization of the electron beam at the collision point, which significantly enriches the physical program of the experiment.

The presentation includes discussion of the place of the SCT factory in the landscape of modern high energy physics and provides an overview of the physics program and a conceptual design of the accelerator complex and particle detector.

"A source of ultracold neutrons slowed down by a magnetic or material UCN trap"

V.V.Nesvizhevsky (Nuclear & Particle Physics Department, ILL, Grenoble, France)


Ultracold neutrons (UCNs) are widely used in the physics of elementary particles and fundamental interactions, and can potentially be used in neutron scattering. However, most of these studies are limited by the available UCN densities and fluxes. One of the ways to increase them, as noted already in the first years of research with UCN, is to use peak fluxes in pulsed neutron sources, orders of magnitude higher than the average. In the present work, the concept of UCN sources is proposed, which makes it possible to implement this idea. We propose to produce very cold neutrons (VCN) in converters located in neutron sources and extract them with low losses. We propose a new way of focusing them in time, as well as their deceleration to UCN energies by an escaping decelerating material or magnetic trap. For both pulsed and permanent neutron sources, this method can provide high conversion efficiency of VCN to UCN.

"Interference of waves: from neutron interferometry to neutron spin-echo"

A.I.Ioffe  (based on the doctoral dissertation)

"Algorithms and programs for express-analysis of data in List-Mode of neutron scattering, measured on 2-axis PSDs with a delay line using data acquisition systems based on CAEN digitizers"

Litvinenko E.I.

 

When using CAEN digitizers, serving as electronics of general use, in the considered case of 2-axis PSDs with a delay line, the task of constructing neutron events from measured data should be performed at the software level. The statement of problem and the developed software for a sufficiently fast transformation of the measured data into formats that allow obtaining and visualizing the positional and time-of-flight spectra of neutrons in the process or immediately after the end of the current measurement are described in the paper.

"Quantum Computing Using Multilevel Systems"

Aleksey Fedorov (Head of the group of Quantum Information Technologies, "Skolkovo")

 

Quantum computers are computing devices that use quantum phenomena (such as quantum superposition and quantum entanglement) to solve problems. Quantum computing devices have the potential to outperform classical computers in a variety of tasks, such as cryptanalysis, complex system modeling, and machine learning. The presentation will provide an overview of various models of quantum computing, as well as the main applications of quantum computing devices. We will also consider a model of quantum computing using multilevel systems (qudits). The proposed model is based on a combination of several approaches. The first approach exploits the general relationship between the dimension of the qubits and their link topology, which is necessary for a scalable multi-qudit processor, where higher levels of qudits are used to replace auxiliary qubits. The second approach uses the decomposition of multi-level systems into a set of two-level systems. The application of the approach in current experiments with quantum information processing systems is discussed. The questions of the analysis of quantum computing devices in the context of the theory of open quantum systems will also be touched upon.